The Files eCart are all stored in the WA_eCart folder.
there are files in that folder for the cart object. unless you have multiple cart object files, there should not be any files that are not needed. If you have multiple cart objects, than you can delete the ones you are not using.
The Files for iRite and earlier version of HTMLEditor would be stored in a folder at the site root named either iRite or HTMLEditor depending on which one you used.
The curent versions store the HTML Editor file in the /webassist folder.